Piston ring



Max. 27, 1923.

E. J. DU BOIS ET AL PISTON RING Filed May 14, 1920 I7z vente 23 each other, while the outer peripherai sur- .10, on the flange, 7 in face, 9, of theflange, 7, are parallel with face, 10, of said flange. which is prescnted to the cylinder wall, is cylindrical.

The vertical extent.of the cylindrical surface, 10, on the. flangc, 7. is determined in accordance with the expansive force of the ring and the quantit v of oil which it is desired to leave as a film upon the. cylinder wall; and the less oil it is desiredto leave upon the cylindcr wall, the less wiil be the height of said surface, 1(). other conditions being the same.

The unfianged portions of. the ring are of substantially less diametcr than the bore of the cylinder so that the ring is held under compression soleiy by engagement of the cylinder Wall With the peripheral surface, the operation of the ring.

Th peripheral flange 7 is formed by a shallow peripheral recess so that the reduction in the bearing surface of the oil controlling piston ring is eflected vvithout a corresponding or material reduction in the.

rsiliency or expansive strength et the ring and as the bearing decreases, the ratio of the expansrve surface of the peripheral flange pressure of the ring to the area of the bearing surface of the flange increases. Thus, the feeding Of the oil to the engme varies with the-area of the bearing surface of the flange of the piston ring and it has been found by experience that with an ordinary piston ring giving a mileage of fifty to seventy-five miles for a given quantxty of oil, that the mileage is increased to approximately two hundred and fifty to thrce bundred miles for the same quantity of oil by rducing the area of the bearingsurface of.

the flange of the piston ring tu less than one-half of that of the ring. The area of the bearing surface of the flange of the piston ring may, of course, be varied from this amount to increase or decrease the feed of the oil to the engine and it will be apparent that by means of the reduced bearing surface of the lubricant controlling piston ring 'resulting trom t the proper amount of oii may be fed to an engine and the excess oil may be prevented from being transmitted to the combustion chamber of the 0 iinder and carbon deposits e feed of excess oil to the combustion chamber and the bad efl'ccts thereof are prevented. Also, there is a great saving of oil and the consumption of oil reduced toone-third more or less of the amount ordinariiy consumed. Also by providing the peripheral flange of the form shown and described with the parallel up. per and lower sides and the cyiindrical bearing surface, that the area of the latter will romain constant and Will not vary, incident to wear. n'other words, ail wear on the fiange is uniform.

' making the upper surface, 8, and louer surface, 9, of the ange. 7. parallel with each other the vertical extent of thecylindrical surface, 10, is not affected by wear, but remains constant throughout the life of the ring.

For certain purposes of the invention it immaerial at what point the flang pro ects from the body of the ring. Thus in Fig. 4, we have shown a ring, 4,having the external peripherai flange, 7 locted about midway between the top and bottoin edges of the ring, said flange having its upper surface, 8, parallei with its loiver surface, 9", and having the cylindrical surface, 10, for presentution to the wall of the cylinder.

\Ve have shown our improved paCkin ring applied to the lowermost groove on y in the piston in which position it is most effective in regulating the supply of oil to the engine. It will be understood however, that rings embodying-our invention may be used .in piace of any of the rings, 3.

It wili aise be understood that rings embodying our inW:entionyare adapted for use with pistons working in cylinders of various kinds such,as pumps, air-compressors' and the like.

hat We daim as new and desire to secure by Letters Patent is 1. The combination with a cylinder, and a piston provided with piston ring grooves, of one or more compression rings arranged in the said grooves, and a lubricant control-- ling piston ring located below the compression ring or rings and comprising an integral, substantially cylindrical body formed with an external, circumferential flange having parallel upper and lower sides and a cy1indricai outer peripheral bearing surface of an area of less than one-half of that of the ring, the unfiaDged portion of the ring ,orming with the flange an exceedingly shaiprovided With a circumferential flange hav ing pamallel upper and lower sides and a cyhndrical outer peripheral bearing surface of ring, said flange being.formed by a shall0w peripheral recess reducing the area of the bearing surface& f the ring without a cor rcspmjding reduotion in the expansive controlling piston ring 'comprismg a substantially cylindrical body less than one half of the width of the being 516- e cylmder 

